Middle slide rail of a slide rail assembly



FIG. 1 is a perspective view of a middle rail of a slide rail assembly showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The middle slide rail of a slide rail assembly is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design. 

CLAIM The ornamental design for a middle rail of a slide rail assembly, as shown and described. 